Over the weekend, Volkswagen Group CEO Martin Winterkorn issued a statement that said in part, “I personally am deeply sorry that we have broken the trust of our customers and the public.” Winterkorn also said the company “will cooperate fully” with the authorities and that it has ordered its own external investigation into the matter. “We do not and will not tolerate violations of any kind of internal rules or the law,” he added.

The cars said to be in violation of EPA emissions standards are TDI-equipped 2009–2015 Jetta, 2010–2015 Golf and Audi A3, and 2012–2015 Beetle and Passat models. Those cars have not yet been recalled, and the company says they are safe to drive.